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Caulerpa can leach numerous noxious and toxic exudations above most other algaes. It can be toxic to fishes and invertebrates forced to eat it regularly over time.
The exudations can hamper the growth of stony and soft corals and it can become invasive.
It is best kept controlled in a refugium and not in the reef display as it can overgrow, burn and kill corals.
To prevent caulerpa from going sexual and release accumulated compounds that can harm or kill livestock, they need to be in light constantly and pruned regularly. Good husbandry is needed with caulerpa.

Chaetomorpha is a much more forgiving macro algae to be used as nutrient export.

Hope this helps

Some tips for newbies:1.Evaporation top-ups are done with RO water only, not saltwater2.Please don't keep tangs in a nano - they need lots of swimming space3.Anemones need mature tanks to thrive and clown fish don't need anemones to survive4. "Dilution is the solution to polution" - Anthony Calfo